Electromechanical warp stop-motion for looms.



v J. P. DUSTIN. ELEOTROMEOHANIGAL WARP STOP MOTION FOR L OOMS.

' APPLICATION FILED APR.22,1910.

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35 like #1 J. F. DUSTIN.

ELEGTEOMEOHANIOAL WARP STQP MOTION FOR LOOMS. APPLICATION TILED APR.22,1910.

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S SHEETSSEEET mm mm m J. F. DUSTIN. TROMEOHANIOAL WARP STOP MOTION FOR LOOMS.

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APPLICATION FILED APB.22,191 O UNITED strntrns PATENT OFFICE.

JOHN F. DUSTIN, 01 FULTON, NEW YORK, ASSIGNOR 0F oNE-HAIiF To JOHN W. STEVENSON, or FULTON, EW YORK.

ELEGTROMECHANICAL WARP STOP-MOTION FOR LOOMS.

Specification of Letters Patent.

Application filed April 22, 1910. Serial No. 556,955.

1' '0 all whom it may concern:

Be it known that I, JOHN F.

DUSTIN, a citizen of the United States, and resident of Fulton, county Qf Oswego, State of New York, have inveii'ted an Improvement in Electromechanical Warp Stop Motions for Looms, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

Thisinvention has for its object the production of an electromechanical warp stop motion for looms embodying various novel features of construction, operation and arrangement, as will appear in details hereinafter, the harnesses comprising heddles which also serve as stop-motion controlling detectors to effect the operation of the stopmotion when a warp-thread breaks.

I have so arranged the mechanism that any number of harnesses may be employed, and in connection therewith an annunciator is provided to indicate the particular hainess containing the detector heddle which has brought about the operation of the stopmotion. I have also arranged the harnesses in such a manner that those which are up will take care of a slack thread of a harness which is down, thus obviating unnecessary loom stoppage from slack threads, as ordinarily a slack thread will be taken up in'the operation of the loom.

The controlling-circuit is rendered operative to cause loom stoppage by or through a released detector-heddle in a harness when the latter is down, and I have improved various details of construction in the harness and the circuit-changing devices to eli ect better and more rapid response when required.

The armature of the magnet included in the controlling-circuit is positively depressed at regularly recurring intervals so that when a detector is released to render operative the controlling-circuit the energized magnet is only required to hold the armature down long enough to efiect the operation of the stop-motion, thus enabling me to operate with a much smaller current than is necessary when the magnet is required to attract its armature. 7

These and other novel features vention will be fully described in the'subof my in joined specification and particularly pointed out in the following claims.

Fi ure 1 is a transverse sectional view of a su cient portion of a 100m, showing the harnesses and the parts of the stop-motion embo ying my invention which are located adjacent or upon the right-hand side of the looni frame, the parts being shown in the position assumed just after the shipper has been knocked oil; Fig. 2 is an enlarged detail in side elevation of the magnet and its armature, and the actuator for the knock-0E lever, the armature being shown as moved against the poles of the magnet by said actuator; Fig. 2* is a similar view but showing the actuator in another position, with the armature retracted; Fig. 3 is a transverse section through the loom showing the parts of my invention on or adjacent the left hand side of the loom; Fig. 4 is an enlarged detail in plan of the means for establishing connection between the controlling-circuit and one, of the circuit-terminals on each of the harnesses when the latter are depressed; Fig. 5 is a sectional View of said means on the line 55, Fig. 4-, looking toward the left; Fig. 6 is a front elevation, centrally broken out, of one of the harnesses, and the means at opposite sides of the loom for putting the harness terminals in circuit when a harness is down; Fig. 7 is an enlarged detail in front elevation of one side of a harness; Fig. 8 is a transverse sectional view on a large scale I of a four-harness set, with two harnesses up and two down; Fig. 9 is a side view of one of the detectorliedd-les; Fig. 10 is an enlarged detail of the contact member ad acent the annunciator, shown in Fig. 1.

For convenience in illustration and description the right-hand side of the loom frame is indicated by A, and the left-hand side by B, and the breast-beam C, shipper D, and lay E, Fig. 1, may be and are all of usual or well known construction, a portion of the arch F of the loom frame being shown in Figs. 1, 3 and 6, the means for reciprocating the harnesses being altogether omitted as it can be of any desired construction and forms no part of my invention. Herein each harness frame H is shown as rectangular and in the present case made of wood, and I provided with transversemetal rods 1, 2 1 near its top and bottom and connected at Patented Nov. 1, 1910.-

wardly and downwardly inclined metal.

7 plate 5 attached to the beveled upper face of the bottom bar 6 of the frame. Said tern'iinal 5 is in electrical connection by bolt 7 with an out-curved contact finger 8 at the left-hand side of the frame and depending below it, as shown in Fig. (3, said lingers being omitted in Fig. 8, a four-harness set being shown in Figs. 1 and 8, although any desired number 01? harnesses may be used.

Bet-ween the tern'iinal rods 1 and 2 a transverse bar 9 of wood or other non-metallic material extends across the frame, for a.

purpose to be described, and the heddlcs, which also serve as controlling detectors, are preferably made of relatively thin sheet metal, each. heddie 10 having a beveled lower edge 13, and upper and lower slots 11., 12 for the reception of the terminal rods 1 and 2 3 respectively. an intermediate and longer slot 141 receiving the bar 9.

The warp-threads w are drawn through eyes 15 in the heddles, as herein shown. \Vhen the warp-threads are intact the heddles are lifted by the upper terminal'rods 1 and by engagement of their beveled ends 13 with theplate as the frame H rises from its lowest position, the several slots in the heddles permitting longitudinal movement thereof relatively to the frame.

When a harness is fully depressed, as are the first and third, Figs. 1,3 and 8, there is quite a space between the bottoms of the heddles and the terminal 5, so long as the warp-tln'eads are intact, and hence there is no electrical connectionbetween the contact fingers 4i. and 8, but it a thread is broken its heddle dro )5 onto terminal 5 and the connection is then complete through the hcddle from the terminals 1, 2 to terminal 5.

The inclined terminal tends to shed dust or lint, so that its surface is always clean and in proper condition to make a good contact with a dropped heddle, and by the engagen'ient of said terminal with the beveled end 13 of the heddle the latter is pushed forward, see Fig. 8, the second and fourth harnesses) bringing the rear edges of lots 11 and 12 against the pair oi terminals 1 and 2, to get a perfect contact.

By making a two-part terminal it is impossible for the dropped heddle to fail of proper contact with one or the other of the parts 1 and 2, as will be manifest.

lVhile the heddles complete the connec tion between the transverse terminals 1, 2 and 5 when a frame lifted the, terminals are not then in the coiitrolling-circuit, for

the fingers 42 and 8 are inoperative, as will be explained, and a frame H rises from its lowest position said fingers will break the controllingcircuit before the terminal. plate 5 and terminal 1 pick up the heddlcs.

As the stroke of successive harnesses from frontto rear increases, in order to obtain the proper shed formation, the several noir metallic barst are made of progressively less depth to permit such harness movement, see Fig, 8.

It is unnecessary to stop the loom because i of a slack thread, and the bars 9 are so arranged that those of the lifted harnesses will serve as rests for the warp-threads cooperating with heddles of the depressed frame, or frames, so that the heddle on the slack thread will not at such -time eil'ect loom stoppage.

Referring to Fig. 8, it issupposed that threads w and 10 cotiperating with heddles in the first and third harnesses are. slack, and it will be seen that were it not for the supporting bars 9 of the second and fourth harness, then up, the slack threads would allow their heddles to drop on the terminals 5 and close the'circuit to effect loom stoppage. Said bars 9, then, serve when their harnesses are up warp rests for slack threads of harnesses which are down, and while it'is common in loom structures to have fixed warp rests extended from side to side of the loom I am not aware that warp rests have ever been used. prior to my invention so arranged that lifted harnesses take care of slack threads of harnesses which are depressed.

Upon the arch F at the right-hand side of the loom I mount a bifurcated bracket 16 between the branches of which is held a series of contact disks 17, see Fig. 10, insu lated from each other and arranged to be wiped over by the fingers 4 of the depressed harnesses to close the circuit at such point whenever one of said fingers engages its corresponding disk 17.

Each disk is electrically connected with .one of the drops g, (7 g, of an annun ciator indicated at G, Figs. 1 and 6, the short wires 18 leading from the drops to the wire 19 of the main or controlling-circuit, connected with a suitable source of electricity, as a battery I, Fig. 1. From the other pole of the battery 1. wire 20 leads to the metal loom side A, including the frame in the controlling-circuit, the connection'being continued through shipper D to the knockofii lever 21 fulcru'med at 22, Fig. 1, and having a lateral ear 23, and herein I have shown the lower arm 24 of said lever as forming one member oi a circuit-closer, the other member 25 being mounted on the loom side A, but. insulated therefrom.

When the shipper D is in running position the contact members 24;, 25 will be in contact, said member 25 being made as a a wire 26 it is connected with the coils of an electro-magnet K, herein shown as mounted on"a bracket 27 on the loom side A.

Before describing the parts adjacent the. magnet I will trace the circuit therefrom by wire 28 across the loom to-a bracket mounted on the loom side from, said bracket being shown in Figs. 3, 4 and 5 and comprising two horizontally'extended, parallel arms 22) .29 each provided with bearings 30- to receive the legs of a substantially U-shapcd metal terminal 31,

movable horizontally towardand from the paths of movement of the depending contact fingers 8 on the harness frames. \Vhen" Said terminal 31 is extended, Figs.

5, the fingers-8 of those harnesses which are depressed will contacttherewith and thereby the terminals 5-of such harnesses will be included. in the control]ing-circuit, as will be apparent, and if at such time a heddle 10 drops by breakage of its warp-thread such circuit will be closed through the heddle and terminals 1, 2, and the magnet K will be energized to bring about stoppage of the.

loom. A toggle 32, Figs. 4 and 5, is pivotally connected atits ends with the terminal 31 and a fixed bracket 34, the oint 35 of the toggle having depending from it a link 36 attached to a cam-follower, shown as an arm 37, Fig. 3, having a .fixed fulcrum 38 and held by a spring 39 in engagement with a cam 40 on the cam-shaft L of the loom. "Thefull line position of said follower in Fig. 3"causes the link 36 to break the toggle, see dotted lines Fig. 5, to thereby retract the terminal 31 and openthe circuit by moving itaway from the fingers of any depressed harnesses, the cam 40 being so shaped and timed to effect such retraction just before the harnesses change the shed, but after shipper release if the latter is called for. Inasmuch as the, terminals 5 of depressed harnesses are thus thrown out of circuit before such harnesses begin to rise it will be manifest that the lifting or pick ing up of the heddles by such terminals can not have any effect on the controlling-circuit.

The cam/10 permits the follower 37 to descend and operatively position the terminal 31 (by stralghtening time fo'r'contact with tact finger 8should a for the operation of the stop-motion.

In -Fig.6 a dropped heddle is shown at 10", and it contacts with the terminals 1, 2, and 5 at the'time said terminals are in circuit-through the fingers 4 and 8 and their respective contacting terminals 17 and 31.

Having described the control]ing-circuit and traced the path'of-the electric current therethrough when loom stoppage is called for I will now explain the means by which the shipper is released when required, havany descending c'on-' dropped heddle call 13 but insulated tl1ere 3, 1 and 59 opposite the car 23 on the arm 24 the toggle) in ample ing reference to Figs. 1,2 and 2. Bracket27 has an upturned extension 41 on which is pivoted at 1-2 a metal plate 43 constituting an armature and having a fiat portion .44 to cooperate with the poles of the magnet K, Fig. 2, the armature plate being prolonged rearwardly at 45 and having cam faces -16, 47 thereon, a spring 48 serving to retract saidarmature into the position shown in An actuator, shown as a lever 19, is fulcruined at 50 on a second extension 51 of bracket 27, the lower end of said actuator carrying a roll 52 held by a spring 53 in engagement with a double-throw cam 54 on the cam-shaft L, the tapered high parts of said cam imparting a quick rocking motion to the actuator alternating with rest periods dire to the dwell portions 55 on the cam. \Vhen the actuator is positively rocked by said cam, in Fig. 2, a pin 56 thereon is retracted from the cam faces 46, 47 and the spring 48 swings armature 43 up and away from the magnet- K unless the latter is energized, but as cam 5st revolves the stronger spring 53 rocksthe actuator and causes pin 56 to first traverse the face 46 and thereby depress the armature upon the magnet poles,

overcoming the pull of spring 48, and the pin 56 then travels up onto the cam face 47 and holds said armature against the magnet poles while the roll 52 engages the dwell 55 of the operating cam, as in Fig. 2.

Bearings 57 on the loom side A, Fig. 1, sustain a longitudinally movable transmitter 58 having its front end bentlaterally at of the knock-off lever, the rear end of the transmitter being pivoted at 60 to an elbowlever 61. The longer arm of said lever has a longitudinal slot 62f which receives loosely a stud 63 laterally extended from the upper part of the armature 43, as clearly shown in Figs. 2 and 2 lVhen the armature is retracted by its spring 48, as in Fig. 2 the stud acts to swing the rear end of the elbow lever 61 up and out of the lateral ear 64 on the actuator 49, and the transmitter 58 is pushed back to its normal position by the knock-off lever when the shipper is in running position. This position of the transmitter is shown in Figs. 2 and 2, and itwill be seen by reference to Fig. 2 that when the actuator 49 is operating to hold armature 43 down on the magnet poles the rear end of the elbow lever 61 .is located directly in the path of the ear or bunter 61- on said actuator. Now if the magnet is energized it will hold the armature down as the ear. or hunter 6 1 swings forward. aiid athereupon it will engage and move forward bodily the lever 61, and the transmitter58,.as shown in Fig. 1, so that the bent end 59 of the transmitter engages] the ear 23 and rocks the knock-off lever, .-.-J

' when the shipper is on or in running releasing the shipper D and effecting loom stoppage in usual manner. As the lever ll is thus moved: forward. it slides with relation to' the armature, owing to the pin and slot. connection (ii), ($2, and as shown in Fig. l the release of the shipper opens the controlling-eirenit by separating the arm ll of the knoelool'i' lever and the contact 25. Thus no matter what may be the condition of the rest of the controlling-cirenit it is always open at if, when the loom is at rest, and. it is always closed. at such points position, so that when the loom is stopped there is no waste of eurrent By eti'ecting a positive moven'ient of the armature into engagement with the poles of the magnet h: the latter has no function to perform other than to retain the armature in operative position when the controlling-cin euitt is closed','.:) that a much weaker current can be used than would be possible were the magnet required to attract as well as hold the armature.

The canrshaft IL makes one revolution for each two revolutions of the crar1ksl1aft, as is usual, hence I provide a, double-throw operating cam for the actuator it-l, and the cam 40 at the opposite side of the loom has a double-throw for the same r asons.

The cam is so constructed and timed that it causes the armature to be depressed against the magnet poles for substantially three-fourths of the revolution of the crankshaft, and releases it ust in time to let the end of elbow lever til clear the hunter (it on the actuator when there is no broken warpthread, but iii a dropped heddle has closed the circuit in its frame as the latter descends the hunter will engage and move said lever 61 and the transmitter as the con-- trolling-circuit is eoi'npietely closed when the particular harness-frame is down. It

'is also to be noted that the terminal 8] is retracted from engagement with a contact finger 8 just before the harness starts to rise, thereby opening the circuit at that point, the cam l0 acting: to operativcly po sition the. terminal 31 during one-half the revolution of the erank-slnift J of the loom.

The lingers l and S on the harness-frames are made resilient or spring-like, in order to secure an ell'ecth'e contact with the corre sponding terminals or contact members 17 and 31. i l 7 It will be manifest that the release of the shipper is positively effected throughthe cooperation of the actuator etfi), elbow lever'tl'l and transmitter 58, and the knock-oil lever 21, 24, the actuator at such time beingswung by the action of the cam 54.

While I prefer to use the inclined terminal plate 5 on the harness-frame to cooperate with the correspondingly beveled end of a dropped heddle, because of the ease with stop-motion as a ammo? which lint or dust is shaken off such te i nal by the mo-."ement of the harness, and also because it acts to throw a dropped heddle forward against the double terminal 1, 2, it will be obvious that the operation of the whole will not be interfered with should said lower terminal 5 be set flat on the harnes. frame, and the lower end of the hcddles be made flat instead of beveled it is to be understood that while the nonmetallic bars 9 serve ordinarily as warp rests for slack threads when a harness is down they do not interfere with the operation of the heddles should their warp threads b alt, for the slots l t through which the bars 9 pass are made long enough to permit the proper descent of-a heddle to close the circuit in the harnessfraine when a thread breaks.

Various changes or modii'ications in details of construction and arrangement may,

be made by those skilled in the art without departing from the spirit and scope of my invention as set forth in the claims annexed hereto.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is 1. A. warp st op-motion for looms comprising' a contrellingcneuit for setting in 0 eratien the stopplng mechanism, a series of vertically-reciproeating harness-frames, terminals carried by each frame means to in elude said tern'iinals in the controlling-circuit when a said means including amember moved auton'iatically and independently of the frame as the latter begins to rise, to throw the terminals out of the cireuit,'and a series of metallic heddles in each harness-frame and normally maintained inoperative by their warp-threads when the frame is down, breakage of a warp-thread releasing its heddle and causing closure of the controlling circuit through the terminals on the frame while said terminals are in circuits.

2. Awarp stop-motion for looms comprising a controllinn-circuit for setting in operation the stopping mechanism, a harnessframe having a series of inetallieheddles, terminals carried by the frame and adapted to be electrically connected by a heddle when released by failure of its \Vfllp-tl'llEflCl, re-' silient contact fingers on the outside of the frame and connected with said terminals, 00- operating contact members in the controlling-circuit and arranged to be engaged by thesaid terminal contact-fingers whenithe harness-frame is at or near its lowest position, and i'neans movable independently of the frame to open the circuit by or through one of said contact members as the frame begins to rise.

3. A warp stop-motion for looms comframe is in its lowest position,

prising a controlling-circuit for settin in operation the stopping mechanism, a liarness-frame. having a series of metallic heddles, terminals carried by the frame and adapted to be electrically connected by a heddle when released by failure of its warpthread, contact fingers on the outside of the frame and connected with said terminals, a fixed contact member in the controlling-cincuit, and a movable contact. member also in said circuit, said contactmembers engaging the fingers when the harness-frame is at or near its lowest position, and .positive means to retract the movable contact member from the cooperating finger as the rise of the liar-- .ness-frame begins.

4. In a warp stopanotion for looms, a harness-frame, an upper, transverse terminal thereon having an external contact finger, a series of metallic heddles longitudinally slotted to receive said terminal, a lower transverse terminal on the frame, ex tended beneath the lower ends of the heddles and having an external contact linger, a controlling-circuit for setting in operation the stopping mechanism, means for including said terminals in,such circuit when the harness-frame is at or near its lower position, a dropped heddle at such time completing the circuit through the upper and lower terminals on the frame, and means "to open the circuit at the contact finger of one of the terminals as the frame begins to ise.

In a warp stop-motion for looms,a controlling-circuit for setting in operation the stopping mechanism, a plurality of reciprocating harness-frames each having a series of metallic, longitudinally slotted'heddles, means to complete the controlling-circuit through a dropped heddle when its harness-frame is at or near its lowest position, and a non-metalliccross-bar on each frame extended through the slots in the hcddles thereof and located below .the sheet of warp, the cross-bars 0'11 harness-frames which are raised serving as warp-rests for a slack thread cooperating with a.heddle in a frame which is down, to sustain the heddle and prevent; completion of the controlling-circuit thereby.

6. In a warp stop-motion for'looms, a con.- trolling-circuit for setting in operation the stopping mechanism, a plurality of recipro eating harness-frames each having a series of metalllc heddles normally maintained infiCtlt'Q'by intact warp-threads, means operative when a fran'ie is at a predetermined point in its stroke to close the controllingcircuit through a heddle of such frame if re leased by failure of its warp-thread, and means on the several harness-frames whereby those beyond the predetermined point in their stroke prevent. closure of thecontrolling-circuit by a heddle on a slack thread when suchheddle is in a frame at the circuit-closing point.

In a warp stop-motion for looms, a controlling-circuit for settin in operation the stopping mechanism, a plurality of reciprocatmg harness-frames each having a series of metallic heddles tained inactive by intact warp-threads, means operative when a frame is down to close the controlling-circuit through a heddle of such frame if released by failure of its warp-thread, and means on the harness-frames whereby the frames which are up prevent a heddle in a frame which is down from closing the controlling-circuit if the thread of such heddle is slack.

8. In a warp stop-motion for looms, a controlling-circuit for setting in operation the stopping mechanism, a plurality of reciprocating harness-frames each having a series 'of metallic heddles normally maintained inactive by intact warp-threads, means operative when a frame is down to close the controllingcircuit through a heddle of such frame if relea'sedby failure'of its warp-thread, and a warp-rest carried by each frame, the warp-rests on the frames which are up sustaining a slack thread co-' operating with a heddle of a frame which is down, to thereby prevent closure of the controlling-circuit by the heddle on such slack thread.

In a warp stop-motion for looms, harness-frames, a series of heddles on each, a controlling-circuit, means to close it by or through release of a heddle due to failure of its warp-thread, anelectro-magnet included in said circuit, shipper-releasing means, including a transmitting member, an armature, means to intcrmittingly and positively move it into contact with the poles of said magnet, said means including a bunter, and an engaging member for said bunter, mounted on the transmitter and moved into and out of the path ofthe bu'nter by movement of the armature toward and away from the magnet,' said magnet when energized by closure of the controlling-circuit retaining the armature in abnormal position,

10. In a warp stopmotion for looms, harness-frames, a series of heddles on each, a controlling-circuit, means to close it by or through release of a heddle due to failure of itswarp-thread', an electro-magnetincluded in said circuit, a spring-retracted armature, means to positively move said armature against the magnet poles at regularly recurring intervals, :1 shipper, and releasing means therefor rendered operative when the magnet is energized to retain the armature in engagement therewith.

normally main-- 11. In a warp-stop-motion for looms, harness-frames, a series of heddles on each, a controlling-circuit, means to close it by or 1". In a warp stop-motion for looms, hare ness-franies, a series of heddles on each, a COl1t1Olll11gClYCUlt, means operative onlywhen a harness-frame is at or near its lowest position to close said circuit by or through'a heddle released by failure of its warp thread, an ,electro-magnet included in said circuit, a sprlng retracted armature there? for, posltively acting means to move the air mature against the magnet poles-whenever a harness-i 'amc is down, said means includmg a hunter, a shipper, and releasing means therefor including a member operatively connected with the armature and positionedtherehy in the path of the hunter when the magnet is energized and retains its armature in engagement therewith.

13. In a warp stop-motion for looms, harness-frames, a series of heddles on each, a cont-rolling-circuit, means to close it by or through release of a heddle due to failure of its warp-thread, anelectro-magnet included in said circuit, an armature therefor, positively acting means to move the armature against the magnet poles when a harnessframe is down, a. shipper, releasing means therefor, including a member controlled as to its position by the armature, and apositirely moved hunter to cooperate with said member when the magnet is energized and retainsthe armature in engagement therewith, combined with means to open the circuit automatically when the shipper is released.

14-. In a warp stop-motion for looms, a controlling-circuit, an clectro-niagnet included therein, a pivoted armature, a retracting spring therefor, a rocking actuator coope'ating with said armature to depress the armature against the magnet poles at,

regularly recurring inte'vals, a. hunter oir the actuator, a shipper, releasing means therefor, including a transmitter", and (a member pivoted thereon, and an operating connection between said. member and the armature, to move said member into the hunter path when the armature is depressed against the magnet poles, retraction of the armature moving said member out of the path of the hunter, combined with means to close the controlling-circuit upon breakage of a. warp-thread and when the armature is depressed.

controllingcircuit. to set in operation the ln caltage of a warp-thread when a harness fvices on the harnessframes to prevent closure-ofsaid circuit by or through a slack uthread, and positivelyoperated means exterior to the harness-frames to open the controlling-circuit thereat as each harnesstermined position.

16. In a warp stop-motion for looms, acon' trolling-circuit to set in operation the stop ping mechanism, a series of harness-frames each having a series of metallic heddles, sep arated terminals on each frame, electrically connected by a heddle released by failure of its warp-thread, contact fingers outside the frame and connected with the terminals thereof, a. fixed contact to engage one of said lingers when a frame at or near itsiowcst position, to include the connected. terminal in the circuit, a movable contact to engage the other finger of a frame when such position of the frame is reached, to thereby include the other terminal means to reciprocate said movable contact; and retract it from its coiipe'ating finger when the franiebegrins to rise, whereby the JOHN i DUSTIN.

itnesses:

JOHN 'liios.

15. In a warp stopanotion for looms, a

stopping mechanism, V SGIlGS of harnessframes each having-a series of heddles, I means to close the circuit by or through controlling-oircuit is opened positively 1J9,"

frame in a predetermined position, dee

frame begins to move away from its predein the circuit, and 

